linux-kernel - Re: [PATCH 5/5] usb_debug: EXPERIMENTAL

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Date:	Wed, 6 May 2009 16:24:13 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Oliver Neukum <oliver@...kum.org>
cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Jason Wessel <jason.wessel@...driver.com>, <greg@...ah.com>,
	<linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 5/5] usb_debug: EXPERIMENTAL - poll hcd device to force
 writes

On Wed, 6 May 2009, Oliver Neukum wrote:

> Am Mittwoch, 6. Mai 2009 21:24:56 schrieb Alan Stern:
> > On Wed, 6 May 2009, Oliver Neukum wrote:
> 
> > A little thought yielded the following algorithm.  It assumes there is
> > a fixed set of URBs allocated, unlike what you have done.  Does it make
> 
> No, it does not ;-) Your approach is more general than you think.
> The only important constraint is that the number of URBs in flight
> be limited. It doesn't matter when they are allocated.

You're optimistically assuming that URB allocations will succeed.  I 
guess that's okay -- dropping characters when there's insufficient 
memory seems like a good thing to do.

What's the point of that "reserve_buffer" thing?  Why not just use the 
next URB's transfer buffer?

Alan Stern

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